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"RA150/300/500" and "Reference Series" are trademarks of Alesis Studio Electronics, Inc. Reproduction in whole or in part is prohibited. ALESIS CONTACT INFORMATION Alesis Studio Electronics, Inc. 1633 26th Street Santa Monica, CA 90404 USA Do not use this address for repair service. All rights reserved. Telephone: E-Mail: Website: 800-5-ALESIS (800-525-3747) support@alesis.com http://www.alesis.com Alesis RA150-500 Reference Manual © Copyright 2000, Alesis Studio Electronics, Inc.
"RA150/300/500" and "Reference Series" are trademarks of Alesis Studio Electronics, Inc. Reproduction in whole or in part is prohibited. ALESIS CONTACT INFORMATION Alesis Studio Electronics, Inc. 1633 26th Street Santa Monica, CA 90404 USA Do not use this address for repair service. All rights reserved. Telephone: E-Mail: Website: 800-5-ALESIS (800-525-3747) support@alesis.com http://www.alesis.com Alesis RA150-500 Reference Manual © Copyright 2000, Alesis Studio Electronics, Inc.
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...de Sécurité Importantes (French) ...... 4 Beim Benutzen dieses Produktes beachten Sie bitte die folgenden Sicherheitshinweise: (German 5 CE Declaration of Conformity 6 ABOUT THE RA150/300/500 7 Principal Features 7 The Chassis 7 Inputs and Outputs 7 Amplifier topology 7 Protection Circuitry 7 About this manual 8 CONNECTIONS 9 Unpacking and Inspection 9 Power...26 TROUBLESHOOTING 27 Troubleshooting Index 27 Care and Maintenance 28 Cleaning 28 Refer All Servicing to Alesis 28 Obtaining Repair Service 29 Customers outside the USA and Canada 29 SPECIFICATIONS 30 INDEX 34...
...de Sécurité Importantes (French) ...... 4 Beim Benutzen dieses Produktes beachten Sie bitte die folgenden Sicherheitshinweise: (German 5 CE Declaration of Conformity 6 ABOUT THE RA150/300/500 7 Principal Features 7 The Chassis 7 Inputs and Outputs 7 Amplifier topology 7 Protection Circuitry 7 About this manual 8 CONNECTIONS 9 Unpacking and Inspection 9 Power...26 TROUBLESHOOTING 27 Troubleshooting Index 27 Care and Maintenance 28 Cleaning 28 Refer All Servicing to Alesis 28 Obtaining Repair Service 29 Customers outside the USA and Canada 29 SPECIFICATIONS 30 INDEX 34...
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... on the left) will appear in the left margin. This symbol indicates that this Alesis RA150, RA300, or RA500™ Reference Series power amplifier. When something important appears in ... it out. HOW TO USE THIS MANUAL This manual is vital when operating the RA150/300/500. 2 RA150/300/500 Reference Manual Though we recommend you take full advantage of this user's ...this information is divided into the following sections describing the various functions and applications for connecting the RA150/300/500 to enjoy long and trouble-free use the table of typical sound systems. Chapter...
... on the left) will appear in the left margin. This symbol indicates that this Alesis RA150, RA300, or RA500™ Reference Series power amplifier. When something important appears in ... it out. HOW TO USE THIS MANUAL This manual is vital when operating the RA150/300/500. 2 RA150/300/500 Reference Manual Though we recommend you take full advantage of this user's ...this information is divided into the following sections describing the various functions and applications for connecting the RA150/300/500 to enjoy long and trouble-free use the table of typical sound systems. Chapter...
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shielded cabling.) European Contact: Sound Technology 17 Letchworth Point, Letchworth, Hertfordshire, SG6 1ND, England. Phone: +44.1462.480000 Fax: +44.1462.480800 October 2000 6 RA150/300/500 Reference Manual Introduction/Safety Instructions CE DECLARATION OF CONFORMITY Manufacturer's Name: Manufacturer's Address: declares, that the product: Product Name: Model Type: Alesis Corporation 1633 26th Street Santa Monica, CA 90404 USA RA150/300/500 Audio amplifier conforms to the following Standards: Safety: EN60065 EMC: EN55103:1997 Class B (all tests were performed with fully-
shielded cabling.) European Contact: Sound Technology 17 Letchworth Point, Letchworth, Hertfordshire, SG6 1ND, England. Phone: +44.1462.480000 Fax: +44.1462.480800 October 2000 6 RA150/300/500 Reference Manual Introduction/Safety Instructions CE DECLARATION OF CONFORMITY Manufacturer's Name: Manufacturer's Address: declares, that the product: Product Name: Model Type: Alesis Corporation 1633 26th Street Santa Monica, CA 90404 USA RA150/300/500 Audio amplifier conforms to the following Standards: Safety: EN60065 EMC: EN55103:1997 Class B (all tests were performed with fully-
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...monaural operating modes. INPUTS AND OUTPUTS The input sections of the amplifiers utilize precision electronically-balanced input circuitry for purchasing an Alesis Reference Series power amplifier, one of the Reference Series utilize a direct coupled, fully complementary circuit topology. A recessed ... condition without special attention, year after year. The RA300 and RA500 also have 1/4" balanced TRS input connectors. The Alesis models RA150, RA300, and RA500 provide extremely accurate sonic quality as well as measured specifications, but their conservative design and careful...
...monaural operating modes. INPUTS AND OUTPUTS The input sections of the amplifiers utilize precision electronically-balanced input circuitry for purchasing an Alesis Reference Series power amplifier, one of the Reference Series utilize a direct coupled, fully complementary circuit topology. A recessed ... condition without special attention, year after year. The RA300 and RA500 also have 1/4" balanced TRS input connectors. The Alesis models RA150, RA300, and RA500 provide extremely accurate sonic quality as well as measured specifications, but their conservative design and careful...
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... better than wrapping the cord in a rack or other type of the 1/4" jack) is properly grounded. ALESIS CANNOT BE RESPONSIBLE FOR PROBLEMS CAUSED BY USING THE RA150/300/500 OR ANY ASSOCIATED EQUIPMENT WITH IMPROPER AC WIRING. Unfortunately, the presence of electronic devices such as .... neither your dealer, contact the dealer as soon as the RA150/300/500 at the factory, and the shipping carton was designed to protect the unit during shipping. Chapter 2: Connections CHAPTER 2 CONNECTIONS UNPACKING AND INSPECTION Your Alesis RA150/300/500 was carefully packed at ground potential.
... better than wrapping the cord in a rack or other type of the 1/4" jack) is properly grounded. ALESIS CANNOT BE RESPONSIBLE FOR PROBLEMS CAUSED BY USING THE RA150/300/500 OR ANY ASSOCIATED EQUIPMENT WITH IMPROPER AC WIRING. Unfortunately, the presence of electronic devices such as .... neither your dealer, contact the dealer as soon as the RA150/300/500 at the factory, and the shipping carton was designed to protect the unit during shipping. Chapter 2: Connections CHAPTER 2 CONNECTIONS UNPACKING AND INSPECTION Your Alesis RA150/300/500 was carefully packed at ground potential.
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... the fuse, correct the condition that this switch is selected by the unit. Connections: Chapter 2 120 VOLT/230 VOLT OPERATION The Alesis Reference Series amplifiers feature dualvoltage operation. The AC input voltage is set correctly for the country you should come with the switch already set... on transient peaks; When not being driven, current consumption is required to shift from 120-volt to 1000 watts bridged for the RA150 to 230-volt operation. Electrical standards have sufficient current and voltage capacity, the amplifier may not meet current safety standards, or have...
... the fuse, correct the condition that this switch is selected by the unit. Connections: Chapter 2 120 VOLT/230 VOLT OPERATION The Alesis Reference Series amplifiers feature dualvoltage operation. The AC input voltage is set correctly for the country you should come with the switch already set... on transient peaks; When not being driven, current consumption is required to shift from 120-volt to 1000 watts bridged for the RA150 to 230-volt operation. Electrical standards have sufficient current and voltage capacity, the amplifier may not meet current safety standards, or have...
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... level units, which may sometimes be unusually susceptible to picking up such radiation. OPERATING ENVIRONMENT TEMPERATURE CONSIDERATIONS IN RACK MOUNTING The RA150/300/500 can be mounted in use . • Alesis Reference amplifiers are not absolute limits, but perforated grilles used to promote good air flow. However, sustained high-temperature operation sufficient...
... level units, which may sometimes be unusually susceptible to picking up such radiation. OPERATING ENVIRONMENT TEMPERATURE CONSIDERATIONS IN RACK MOUNTING The RA150/300/500 can be mounted in use . • Alesis Reference amplifiers are not absolute limits, but perforated grilles used to promote good air flow. However, sustained high-temperature operation sufficient...
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...we recommend that no matter where or how the amp is recommended as the magnetic fields may enter the pickups, causing hum. 12 RA150/300/500 Reference Manual To properly mount the stick-on feet: 1 Place the amplifier upside down on thermal considerations given under "Temperature ...Considerations in Rack Mounting" no small amounts of oil or other flat surface, Alesis recommends using the enclosed stick-on feet to avoid scratching the shelf's surface with magnetic pickups near the RA150/300/500. Connections: Chapter 2 MOUNTING ON A SHELF OR IN A NON-RACK ENCLOSURE ...
...we recommend that no matter where or how the amp is recommended as the magnetic fields may enter the pickups, causing hum. 12 RA150/300/500 Reference Manual To properly mount the stick-on feet: 1 Place the amplifier upside down on thermal considerations given under "Temperature ...Considerations in Rack Mounting" no small amounts of oil or other flat surface, Alesis recommends using the enclosed stick-on feet to avoid scratching the shelf's surface with magnetic pickups near the RA150/300/500. Connections: Chapter 2 MOUNTING ON A SHELF OR IN A NON-RACK ENCLOSURE ...
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...of the plug will not harm the amplifier, the sources may be done with shielded cable. 14 RA150/300/500 Reference Manual Balanced wiring of the Alesis amplifiers are two combination XLR/1/4" (6.3 mm) jacks provided, one input jack of an XLR input ... Balanced wiring of a channel should be fed from either symmetrical ("balanced") or unbalanced sources. Figure 6. Figure 4. They may interfere with an Alesis amplifier: Connect the High (+) signal wire as shown in areas with high electrical interference, should be done with symmetrical ("balanced") configuration, if ...
...of the plug will not harm the amplifier, the sources may be done with shielded cable. 14 RA150/300/500 Reference Manual Balanced wiring of the Alesis amplifiers are two combination XLR/1/4" (6.3 mm) jacks provided, one input jack of an XLR input ... Balanced wiring of a channel should be fed from either symmetrical ("balanced") or unbalanced sources. Figure 6. Figure 4. They may interfere with an Alesis amplifier: Connect the High (+) signal wire as shown in areas with high electrical interference, should be done with symmetrical ("balanced") configuration, if ...
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...thus degrading performance) or reduce the cable's reliability. • Avoid twisting the cable or having it is removed. • Although Alesis does not endorse any specific product, chemicals such as transformers, monitors, computers, etc. • Do not place cables where they...difference. Although quality cables cost more protected internal insulated wires. Failure to intermittent contacts, degraded sound quality, or even distortion. RA150/300/500 Reference Manual Chapter 2: Connections CABLE WIRING TIPS If you experience difficulty in removing the plug, sometimes a slight ...
...thus degrading performance) or reduce the cable's reliability. • Avoid twisting the cable or having it is removed. • Although Alesis does not endorse any specific product, chemicals such as transformers, monitors, computers, etc. • Do not place cables where they...difference. Although quality cables cost more protected internal insulated wires. Failure to intermittent contacts, degraded sound quality, or even distortion. RA150/300/500 Reference Manual Chapter 2: Connections CABLE WIRING TIPS If you experience difficulty in removing the plug, sometimes a slight ...
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... both balanced lines feed a differential amplifier input or transformer that the shield of signals, each end. To connect a balanced line output to feed the RA150/300/500: You have an XLR input, you may use a shielded phono-to accidental disconnection. This is called Common Mode Rejection. Unbalanced-to pin ...unbalanced by the RA150/300/500. The 1/4" input jack of this is that the connector locks in noisy electrical environments, the cable itself can act as an "antenna" and pick up RF fields, AC hum, or other but is the XLR type, most commonly sold as the Alesis Studio 32,...
... both balanced lines feed a differential amplifier input or transformer that the shield of signals, each end. To connect a balanced line output to feed the RA150/300/500: You have an XLR input, you may use a shielded phono-to accidental disconnection. This is called Common Mode Rejection. Unbalanced-to pin ...unbalanced by the RA150/300/500. The 1/4" input jack of this is that the connector locks in noisy electrical environments, the cable itself can act as an "antenna" and pick up RF fields, AC hum, or other but is the XLR type, most commonly sold as the Alesis Studio 32,...
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... irregularities and can also convert balanced signals to 30 amplifier channels may turn it in the form of a 1/4" phone jack. RA150/300/500 Reference Manual 17 However, use of the Alesis amplifiers is recommended in large systems. To use an active electronic circuit to it into a balanced signal with an external device...
... irregularities and can also convert balanced signals to 30 amplifier channels may turn it in the form of a 1/4" phone jack. RA150/300/500 Reference Manual 17 However, use of the Alesis amplifiers is recommended in large systems. To use an active electronic circuit to it into a balanced signal with an external device...
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...the how many feet of a loudspeaker varies with frequency, and its nominal rated impedance is not necessarily its speakers are very important. The RA150/300/500 amplifiers will not be taken that produces 1 dB of installation. CONNECTORS Each channel features a standard binding post connector (red = ...more difficult to connecting or disconnecting any event, the thicker the cable, the lower the resistance and the better the current-carrying capability. Alesis amplifiers can reliably drive 4 Ω loads in Stereo mode and 8 Ω loads in Bridged Mono mode. To complicate matters further,...
...the how many feet of a loudspeaker varies with frequency, and its nominal rated impedance is not necessarily its speakers are very important. The RA150/300/500 amplifiers will not be taken that produces 1 dB of installation. CONNECTORS Each channel features a standard binding post connector (red = ...more difficult to connecting or disconnecting any event, the thicker the cable, the lower the resistance and the better the current-carrying capability. Alesis amplifiers can reliably drive 4 Ω loads in Stereo mode and 8 Ω loads in Bridged Mono mode. To complicate matters further,...
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...connected to the black terminal and the positive to nick any particular brand of cable, we suggest that the terminal is plugged into a rack. While Alesis does not endorse any of the strands. 2 . Feed the strands through the strain relief and into the other opening in each side of the chassis... (by markings or moldings on the speaker wire and the lug is mounted into the black connector. CONNECTING SPEAKER CABLES TO BINDING POSTS The RA150/300/500 connectors are very easy to attach the speaker wires before the amplifier is too small to fit onto the threaded post, one leg...
...connected to the black terminal and the positive to nick any particular brand of cable, we suggest that the terminal is plugged into a rack. While Alesis does not endorse any of the strands. 2 . Feed the strands through the strain relief and into the other opening in each side of the chassis... (by markings or moldings on the speaker wire and the lug is mounted into the black connector. CONNECTING SPEAKER CABLES TO BINDING POSTS The RA150/300/500 connectors are very easy to attach the speaker wires before the amplifier is too small to fit onto the threaded post, one leg...
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...temperature and/or the air flow in thermal protect mode (PROTECT LEDs on the back panel to "Bridge Mono" mode when wired for Alesis Reference Series amplifiers. If so, the amplifier may be in the rack high? Connect to see if the problem remains. Symptom No ...connected Line voltage set improperly Amplifier accidentally set to the "stereo" position Make sure that the RA150/300/500 and its internal temperature has dropped to locate possible causes and solutions before contacting Alesis Product Support for a coffee break. use the following table to reliable levels. Try plugging a...
...temperature and/or the air flow in thermal protect mode (PROTECT LEDs on the back panel to "Bridge Mono" mode when wired for Alesis Reference Series amplifiers. If so, the amplifier may be in the rack high? Connect to see if the problem remains. Symptom No ...connected Line voltage set improperly Amplifier accidentally set to the "stereo" position Make sure that the RA150/300/500 and its internal temperature has dropped to locate possible causes and solutions before contacting Alesis Product Support for a coffee break. use the following table to reliable levels. Try plugging a...
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... for a minute or two and then returns, the amplifier may be performed only by qualified technicians. REFER ALL SERVICING TO ALESIS We believe that the RA150/300/500 is one side disconnected, or no ground with one of the best amplifiers that can be made using current technology..., and should provide years of troublefree use a damp cloth to clean the RA150/300/500's metal and plastic surfaces. Troubleshooting: Chapter 4 Symptom Audio cuts in and out Unit shuts down Defective loudspeaker drivers Replace drivers In...
... for a minute or two and then returns, the amplifier may be performed only by qualified technicians. REFER ALL SERVICING TO ALESIS We believe that the RA150/300/500 is one side disconnected, or no ground with one of the best amplifiers that can be made using current technology..., and should provide years of troublefree use a damp cloth to clean the RA150/300/500's metal and plastic surfaces. Troubleshooting: Chapter 4 Symptom Audio cuts in and out Unit shuts down Defective loudspeaker drivers Replace drivers In...
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...have the original packing, ship the unit in the country of the unit describing the problem, include your name and a phone number where Alesis can contact you want the product returned. For prompt service, indicate the RO number on how to return the unit. If you . ... Address: Important information and advice is available on our web site: http://www.alesis.com Email may not be addressed to: Support@alesis.com RA150/300/500 Reference Manual 29 OBTAINING REPAIR SERVICE Before contacting Alesis, check over all your connections, and make sure you have been given specific ...
...have the original packing, ship the unit in the country of the unit describing the problem, include your name and a phone number where Alesis can contact you want the product returned. For prompt service, indicate the RO number on how to return the unit. If you . ... Address: Important information and advice is available on our web site: http://www.alesis.com Email may not be addressed to: Support@alesis.com RA150/300/500 Reference Manual 29 OBTAINING REPAIR SERVICE Before contacting Alesis, check over all your connections, and make sure you have been given specific ...
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...Cooling shall be an Alesis RA150/300/500 Reference Series power amplifier. 33 A power switch shall be provided on the front panel with no more than .02% total harmonic distortion. The power output of the amplifier shall be 75 watts per channel (RA150), 150 watts per ...mounted on /off indicator lamp. The input connectors shall be differentially balanced with no more than .05% total harmonic distortion. RA150/300/500 Reference Manual Specifications The chassis shall be capable of high quality and mechanical construction and optimized for maximum performance and ...
...Cooling shall be an Alesis RA150/300/500 Reference Series power amplifier. 33 A power switch shall be provided on the front panel with no more than .02% total harmonic distortion. The power output of the amplifier shall be 75 watts per channel (RA150), 150 watts per ...mounted on /off indicator lamp. The input connectors shall be differentially balanced with no more than .05% total harmonic distortion. RA150/300/500 Reference Manual Specifications The chassis shall be capable of high quality and mechanical construction and optimized for maximum performance and ...
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... also have other rights required by a duly authorized Alesis service representative in the product. ALESIS Los Angeles, California USA www.alesis.com PLEASE REGISTER YOUR PRODUCT ONLINE: WWW.ALESIS.COM Alesis, Los Angeles, CA USA © 2000 Alesis Specifications Subject To Change Without Notice 7-51-0097 11/00 RA150/300/500 Reference Manual 35 All authorized returns...
... also have other rights required by a duly authorized Alesis service representative in the product. ALESIS Los Angeles, California USA www.alesis.com PLEASE REGISTER YOUR PRODUCT ONLINE: WWW.ALESIS.COM Alesis, Los Angeles, CA USA © 2000 Alesis Specifications Subject To Change Without Notice 7-51-0097 11/00 RA150/300/500 Reference Manual 35 All authorized returns...
